... I'm beat! 我累惨了！ lost track of doing 忘了做某事 wide-awake all night 彻夜无眠 ...
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lost track of doing
不知道做什么
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In doing so, they lost track of the most essential characteristic of a large-scale energy storage system: it must be cheap.
FORBES: Storage, Not Generation, is the Challenge to Renewable Energy
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